chore: add bot command /snapshot

.github/workflows/bot.yml

@@ -0,0 +1,45 @@
+on:
+  issue_comment:
+    types: [created, edited]
+
+name: Bot
+
+jobs:
+  pr_snapshot_commented:
+    # This job only runs for pull request comments
+    name: PR snapshot comment
+    if: ${{ github.event.issue.pull_request && github.event.comment.body == '/snapshot' }}
+    strategy:
+      # Do not run in parallel because we may create a new commit
+      max-parallel: 1
+      matrix:
+        name: [windows, linux]
+        include:
+        - name: windows
+          os: windows-latest
+        - name: linux
+          os: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    env:
+      # Set TRYCMD=overwrite to update snapshot
+      TRYCMD: overwrite
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions-rs/toolchain@v1
+      with:
+        components: rustfmt, clippy
+      # Pinned to the commit hash of v2.2.1
+    - uses: Swatinem/rust-cache@6fd3edff6979b79f87531400ad694fb7f2c84b1f
+      with:
+        shared-key: pr-snapshot-commented-${{ matrix.name }}
+    - uses: actions-rs/cargo@v1
+        # Generate new snapshots
+      with:
+        command: test
+        args: cli_tests
+    - run: |
+        git config user.name "github-actions[bot]"
+        git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+        git add .
+        git commit -m "test: update snapshot for ${{ matrix.name }}"
+        git push